What if completing all 3 nightfalls (1 per character) awarded you with a random 320 item from either the vanguard, crucible or faction?
Completely random item.
TL:DR - completing nightfall on all 3 characters give a random 320 item.
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Up the light level to 300, make the rewards 310+, with 320 exotics. That's how we do it. [spoiler]and while we're at it can Xûr for the love of god just sell 310 exotics? Even if I want an exotic he has I don't buy it because God it'll just murder the light levels [/spoiler]